[MD settings] disable clear browsing data while it is running

chrome/browser/ui/webui/settings/settings_clear_browsing_data_handler.cc

Index: chrome/browser/ui/webui/settings/settings_clear_browsing_data_handler.cc
diff --git a/chrome/browser/ui/webui/settings/settings_clear_browsing_data_handler.cc b/chrome/browser/ui/webui/settings/settings_clear_browsing_data_handler.cc
index 69b69b41957c533a2651003c878b409a10b528f2..508ad18056066adfd54e8743ce6d6e599d1ab697 100644
--- a/chrome/browser/ui/webui/settings/settings_clear_browsing_data_handler.cc
+++ b/chrome/browser/ui/webui/settings/settings_clear_browsing_data_handler.cc
@@ -213,6 +213,8 @@ void ClearBrowsingDataHandler::OnBrowsingHistoryPrefChanged() {
 
 void ClearBrowsingDataHandler::HandleInitialize(const base::ListValue* args) {
   AllowJavascript();
+  const base::Value* callback_id;
+  CHECK(args->Get(0, &callback_id));
 
   // TODO(msramek): Simplify this using a factory.
   AddCounter(base::WrapUnique(new AutofillCounter()));
@@ -225,6 +227,8 @@ void ClearBrowsingDataHandler::HandleInitialize(const base::ListValue* args) {
 
   OnStateChanged();
   RefreshHistoryNotice();
+
+  ResolveJavascriptCallback(*callback_id, base::FundamentalValue(!!remover_));
 }
 
 void ClearBrowsingDataHandler::OnStateChanged() {